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f.lux 4.51 Beta

Makes your computer usable at night

Free Download

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f.lux screenshotDid you ever wake up ready to write something important, and get blinded by your PC display?

During the day, PC displays are looking good - they are created to look like the sun. But, at 10PM, 9PM, and 3AM, you perhaps shouldn't be stare at the sun.

f.lux resolves this issue: it makes the color of your PC's display adjust its brightness to the time of day: warm at night and bright during the day.

f.lux makes your PC display look like the room you are in, all the time. When the sun sets, it makes your PC look like your indoor lights.


  • Relieves eyestrain.
  • Easy to use.
Name f.lux
Version 4.51 Beta
Developer | see all products from this developer
Product Homepage f.lux
License Free (Freeware)
Last Week Downloads 7
All Time Downloads 929
Filename flux-setup.exe
Filesize 0.7MB
MD5 Checksum 356656A6FA1C2573B8F25A6A04961AF2
OS Support Windows All
Category Desktop Enhancements

100% CLEAN Certification

Badgef.lux has been tested by team against viruses, spyware, adware, trojan, backdoors and was found to be 100% clean. Our editors will recheck this software periodically to assure that it remains clean.


Old Versions

Software Date Added
f.lux 4.60 Beta January 10, 2018 - Latest Version
f.lux 4.55 October 18, 2017
f.lux 4.53 Beta October 06, 2017
f.lux 4.51 Beta September 29, 2017
f.lux 4.43 Beta August 18, 2017

Download the free f.lux